Call your county extension office. Not only might they know where to get eggs they may have equipment you can use, people with expertise that can help you, or even a curriculum you can use. You never know until you ask.
Go to the "Buy-Sell-Trade" section of this forum and start a thread. Include your location and that you are a teacher in the title. You might be amazed at how many people are willing to help.
Find the Florida thread in the "Where am I? Where are you!" section of this forum and chat with your neighbors.
Go to a feed store and chat with the employees. They may know someone but mainly I'd ask about a bulletin board where I could post a notice.